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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2011.0135 Vulnerability in Windows Client/Server Run-time Subsystem Could Allow Elevation of Privilege 9 February 2011 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Windows Client/Server Run-time Subsystem (CSRSS) Publisher: Microsoft Operating System: Windows XP Windows Server 2003 Impact/Access: Increased Privileges -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2011-0030 Original Bulletin: http://www.microsoft.com/technet/security/Bulletin/MS11-010.mspx - --------------------------BEGIN INCLUDED TEXT-------------------- Microsoft Security Bulletin MS11-010 - Important Vulnerability in Windows Client/Server Run-time Subsystem Could Allow Elevation of Privilege (2476687) Published: February 08, 2011 Version: 1.0 General Information Executive Summary This security update resolves a privately reported vulnerability in the Microsoft Windows Client/Server Run-time Subsystem (CSRSS) in Windows XP and Windows Server 2003. This security update is rated Important for all supported editions of these operating systems. For more information, see the subsection, Affected and Non-Affected Software, in this section. The vulnerability could allow elevation of privilege if an attacker logs on to a user's system and starts a specially crafted application that continues running after the attacker logs off in order to obtain the logon credentials of subsequent users. An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users. The security update addresses the vulnerability by correcting the manner in which user processes are terminated upon logoff. Affected Software Windows XP Service Pack 3 Windows XP Professional x64 Edition Service Pack 2 Windows Server 2003 Service Pack 2 Windows Server 2003 x64 Edition Service Pack 2 Windows Server 2003 with SP2 for Itanium-based Systems Vulnerability Information CSRSS Elevation of Privilege Vulnerability - CVE-2011-0030 An elevation of privilege vulnerability exists in the way that the Windows Client/Server Run-time Subsystem (CSRSS) terminates a process when a user logs off. An attacker who successfully exploited this vulnerability could run code designed to monitor the actions of a user who subsequently logged on to the system. This could allow the disclosure of sensitive information or access to data on the affected systems that was accessible to the logged-on user. This sensitive data could include the logon credentials of subsequent users, which an attacker might later use for elevation of privilege or to execute code as a different user on the system. Note that this vulnerability would not allow an attacker to execute code or to elevate their user rights directly. It could be used to collect useful information to try to further compromise the affected system. If a user with administrative privileges subsequently logs on to the system, the attacker could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full system rights. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. 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If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iD4DBQFNUdRq/iFOrG6YcBERAl0lAJUTyB49vA+QEGo27XSRT12BlBbfAJ0cHImp 4yC4M6lU7IKgwjxghCcXkw== =+gFS -----END PGP SIGNATURE-----